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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abc7434c6ac7a128c64ebf4d2c83b028b5add8ab4e54e70ff3d2baf5e974b83' 
  AND token = 'eeyWS0yWG04qAXlpJHyWFm7ooqpXxrL0/6PflF9iyzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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