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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdae5c6995fb8823320d6dcc0e5829aeff73ee6a988ef44b876c29a627534efe' 
  AND token = 'V/uLQP81Acsrc6NeFxHoGd/Rgt/5WF647PxZT0eyx44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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