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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab4ccbd9bcc96a44a05d440dc578c8e4100afa30c4d7540b36b02bcb4ae47ff' 
  AND token = 'pK4IYZDXMzBam/8BdSUM1uYeSncId0Jmwdvg+D3WsIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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