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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd091d24bacf8679e3cf9c80765e511c2cc6909cee10b66715492444b352cb6cf' 
  AND token = 'FL3Fpe+0te7/71v9ra6Od+3PDpzS10V88dHNjGVaYDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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