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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630c614c290b93c78ca63f30a7d8d53261360f356041c9a476017d113b666d6b' 
  AND token = 'O5qXqBtmzRNgIKD7bYJKJL+1KLDH76fMXMSrOt4s+NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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