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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4355fa9860826e5007a1f7ce37f92d160e7a5803c41645745b9ec62f80dbb3b' 
  AND token = 'OuI2doCFHp6B8BoQSJ2qNpXCghNpBKofkcRGoyqyXzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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