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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a8fd3e60edd5fed15ad88f10234a5b5d74f175bb9ab52846133300f73c95d6' 
  AND token = '8cA4dOeTvNS1PVzWTlUhZlBgSCVE+AD+eyUS9n5aMpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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