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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e83173284cfa9fa35078b5a1c7906c03c3329ad4febe76badc2793c20e0ba1' 
  AND token = 'pXzrwcTWnV3KfixnDAf03VAdfWeqANCZPnCVt+TYCb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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