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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f61ecf4fce834e916f7238c5c2c0a5cd5c999dbadd172b25f53cda10bca2ee' 
  AND token = '2QflUgTMOyfIhlIQlMJY7Io8z/CPo6nBQntlg9YLar0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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