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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b9b4ff99b420d2426edba8270f2f91c691304e49dc52d42eed99371ef3672f' 
  AND token = '2/b6DruVis90OQdhje5ukFKX3wznBMeBwqW21ZEJT+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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