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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ee4e4cbbccafcc0dadcdd20d6482c2ee418cd02f00244aa1d72618dfdd948b' 
  AND token = '7OE8jPOlE9qvEWug7id9ilbRnIfuyTib9rHuPEdiTe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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