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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc3c6bbd5ea95913e9dbd1913aba66145bab76c0c844c1cd066dd7fd19dea2e' 
  AND token = '6CN6YY1mOoOy1l2pEQ3tq2s2WALmjxAPnnFVq/+OA3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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