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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bcfdfeef73cf66821d9d6b8c4d2b24ec36e71ad274a5fbfbb4597ddf9dfe38' 
  AND token = 'RR2RLtfMIv7GXq/xmwwqlBJCE/Zdi2sE2Cxbr2wwH5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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