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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fe7e626711cefe6693385ce5b10f26000005597f93b92d1d13930ddcca6787' 
  AND token = 'mpUAivWOnVoH3lZZknU0crpz1Dwtzhe5WM87EpK5gbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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