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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50f5888bea017ef5fb3dcb9895bd4b35e4ee58842a40b16a5121bd34bc574e7' 
  AND token = 'le5EbaQ+blngiYGYYnxensjgwemFltafLr+A9MXm8Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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