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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac1cc83195e5f44def54af5b8a7b3caeee48682d38957d818fb4087ac36aee6' 
  AND token = '41Rjax9xl0z6vvxCy4ZNhOu49crPdirZXtQp5WA0Cug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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