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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9841940341f46563816d16f6c85a3d705cf64ee173a4baa07cf6469d3f48989e' 
  AND token = 'mCob9T/qvZa7Fmhj5/34eSv1kpALtRH8/uPteWU31Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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