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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d631181939c1ceca18deb90b6e36c4ba61b43ad072319f6e31e5a8c61f3cb9' 
  AND token = 'h+qjfwQ9aoWZYvvfe13Pn/+KR3SlexxmkgJ304x11h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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