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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171bffbcef25a06f9a9202938006e2d74e4d7277e2cf770a797f8c395cab2611' 
  AND token = '5ZSvMtUIyp6GVVVf5ClWf7Y8u4tJ+E9Xlu7RK61QmeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00305

JSON explain

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