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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322a1e3dd99ce8f4753126548f6106dc0803d9c04674f96f85c96baa2f69d22e' 
  AND token = 'sJIIvGCTJMiZD68WtSCIDN9wFt7IrD8UiULpIWta6Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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