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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0e64c51052ad69d569ea8adfb870ebdf0dc54b63276bbe35188f903120c767' 
  AND token = 'x5cGDOiHTrAAZO8qkQtLe8G9IPwEbGUkqAs0hYWJ1wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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