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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ff81c4dc5489fafe2b710c3e987f343b1bbd5f8289900969c56dcdd0aa924' 
  AND token = 'Lr6LSD81uLwafigWBFD3ANnhwiMwi3QvnmXwgktzI3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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