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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70edd2b6a16e9f7e634387d944fa6fc3cee233fa4c581bfcbe1d331e127c0862' 
  AND token = 'SqHpMk8A596QqIsxRw2i77sR9KMH6+uhQL06eqyEtWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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