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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2761239be6d9df692ff3f94ecc64cff3a224633a551b9ffbe0453a11ce142b33' 
  AND token = 'UjbrVuMxx5+HTd8p6f8NfC61BCoN48StLQxtpYrH28w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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