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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02449efcf5ee2eae938a51478ca018018c5ed8dee24206c340fd8d20f18e9f3' 
  AND token = 'yPyY6Bi2kLMuAhaD2+5duC7PaewonK0VyKNfaP8slu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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