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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ecfce739e21ca38c84a0291223dae7ec78015d9374fba411ad92f39f3f4e674' 
  AND token = 'CiXQWVXGGPTIjIPlotnwXj2Ltke/KPgyDuSOEUgqdBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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