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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d706abf9e98931e8227b3306673fd5de6cfee6772410c125f4d139fa203fa37' 
  AND token = 'CmiuBCYu9QjezA/ThNS4sOKpdyPq0X6ijR/20FRf7qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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