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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb1e20257c63266ec775fcb56e4ab98c5cda3ae4ebe3a7144b99c67d7ad1a02' 
  AND token = 'OzCwFL8Dx7jr8Vo6MJGeVsIPDtn/0eVJ27OBZBEAod0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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