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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de261b376d093e31d9c73ed5a47aea67b790b47d1c7ba7e4bc126e9b74a330a8' 
  AND token = 'EUqJ7jPFuXqt0wWligAX2aPFGb28IlHk9OPhPqM2O7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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