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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fd4f1b46e59d8940de7b84519ee09f3408dbe01289c92281732b4b0c90349b' 
  AND token = 'wUAb44N+XzCoy3ylHSy2h+sNQEquoYS0iQK0Yj+pdO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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