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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51638c4b86f0cde9bdc8de190faaff24c170c4725e8d41a0c329e549bca04971' 
  AND token = 'syHDjK3ExLcK4eh6XnpnRkTNsN8/3oqrdcgJkOm9C7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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