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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f0e9f974b9fdbe198418527511b81df53c319f98791719a65a5667e56d2dfe' 
  AND token = '0s+0S/ygpwaHgu69twae6EN2H3/U9d22PICy/m/PeZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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