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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfeab22d9cb4c9c8282cf42363a003e7a0372dabce896f5c240a5eb166499f7' 
  AND token = 'JAdMezs4x3yvh9daoFv2BvnfNuQXNOaex5ytdWiXc80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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