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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc87aba5beba22a91f75495ffd504a36ced242c4df4d4e463a1864ae729b1da1' 
  AND token = 'E/w3SEpd4e1ZX9N/nvPHVK8Di1xgwvHX0pa7JkRzRDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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