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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d422ecbebc05c932ce5b3e6471e5d68a7d3eb04b283ac8eec3d44eab7616a73' 
  AND token = '22Uz4dD/M0dk59CFF5hJyTuwftyHT3I5IbWDzhNnokw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}