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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc4fa77095a249461a32f5a23b56bd2a482ee8c4c7d62a6855732c1fa47914e' 
  AND token = 'VdTErA3fMlYV1u0JnVG3+/aFDzY9bZ/A7AJtFbCCpL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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