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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01c364c35351f5e79c30dd25ed61e67ff9cb62316807b7522011a3b6c1e8e6f' 
  AND token = '02roIAPht61IgjYSzv1Hi1RZob+s6lCfyQmwnZm0XGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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