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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe52d123c7e38f6d300466a00a743054c164d4014926b14e159f512d064492a' 
  AND token = 'QKRn1OwA45lOTcB8k8M718B3xSkT2x/krfJOyd+zUks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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