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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f068c39d51405159fb59a6ef0db557b672dc080ddd9dda94b6a98ef244bbb34' 
  AND token = '6EiZg9P4X1fVVY/hs0hqZqBEbj28MgEeXAwZo7JQao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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