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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea119b769294423c712785e5072db73f1bdd5d04569bc278e5d5bbccf166c716' 
  AND token = 'hP7LSytnBGfkn3vkfOEHVQ1KlGvsmApIQnZebkMgkh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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