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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c6063224a142899fce3937cade3bcb35a14e50476759751a5a32762e33e823' 
  AND token = '68dQuSGyFB4i7pkI5rMqPK7aLx2P03yz0tzWXfco5+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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