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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79708f10a178d3ad899b13468e42d6b2895a38a902b3659ed6b3a61e73885106' 
  AND token = 'BMncPnm/HeuTXpEJTE9QWwzs1k63t+x6DfH7UJ5d/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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