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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1155d85f0da1ccf20084f4673dc4d58d984ad24988437626425c09868d26970' 
  AND token = '58wnn0NorO0Umj+Xoni6l22xZyoXGpgrX6b6RofTp3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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