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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c8c9b7654f22a91c3ba659e04f0fc9d2d98317a93190ffb893b863441e3734' 
  AND token = '1Szjy2c5fdy+Fkv8Ln1db/vtGqBBpMYDWakecuUnMAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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