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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7b907fe33fdd1c3799652e72d006077a771e27f2cdd28fa94794427c0b7b19' 
  AND token = 'UEfnIbtt8GgvJqXHsPaXrXS6AXxY3+0LGCfHuVt+A88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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