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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6bb8b2673d7a383cc0823e1bed58c4dc543b251f2fee4845f958fcc2b438ab' 
  AND token = '+r9ycrd+kj1lpHzFwXgme3LpIfJK9wb1wqm0nPl6iw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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