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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369aeae28742ec7862a35dd2e5fddeb6ee195413fca40ec3299b6532f22ffc5f' 
  AND token = 'tsz1W6CXPXXBQ7XS4zAKhl0n/BTS7ikPtZ3D2RwiCsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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