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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060eaaf1e7c50cd7cb605869781b8bef36fae9f62c3958f0e83f0e0eb9d9675f' 
  AND token = 'f7seiSLEgYWHuKevd7VSTtxPc2m9SB2cmL1cyfe/9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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