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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ca6333d809aea962519b8f58196eb27fc99d46344833be3aa705b5b7dfa8e2' 
  AND token = '4thAKpdVx85r1wg4rBZ35i5NKWfQIO7rkyUw2ATRC4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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