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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cf74ff084f1dd87088912bc578512e1f9d8f86c8d1ca92290e6572e2578401' 
  AND token = '168R6aWfmMfqzYJ/nSYLDt65Nx1PxEMcdf1Aiz910MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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