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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c075a8d881bf2c0e10b8e81dd51db76ec2346ad8fe4cae93c710b1ef6fc1d6b3' 
  AND token = 'Tth5X/GL2vY2OB9xLE+fC+of4OBYptHNoHWJYQTWs2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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