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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74b5ec4b9ff103c26bcba80b5cddc6561c35179e2b0cab06671ce8f929c7cc9' 
  AND token = 'kaGSpnzK5S0882LXD4ue3dk9MMjXf76f+wv7iSKnnnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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