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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05fbc4d415b44a4d31b8f016b1bcfc52abec2aa1e6f102a10fbaaa74ff3f70a' 
  AND token = '15V1UIBAYzTSdS6Hyy0hELAGqfoHf2wwQl9hVUjWs+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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