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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a974e975a37836a0105561fc0546f6c52b6de8dda66f37c1eafae4fb49dedc' 
  AND token = 'ZWpFdY6HO8y/97Tb0wcxzTyzFc409AQQ7no3r2wSWnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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