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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c40879681e3f05b34e5fc654d1b994150cd8827ed1976c04a5039676358fb07' 
  AND token = '2L5lkl6e1pVElWYbAOsnRBjKjFw8mjAUelnaDQqVt8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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