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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7332038f89d01da81ea46cfe86fbed5f430d7979d96a14b109f47cb0bbcff8' 
  AND token = 'v4co2WRoJyp6icv0N2p+PfAtm3452kXu8LxQDKYgj4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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