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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0336c4701411e5743afd176b44280c8e6937ad478a6ea1e7760380ad987e1a' 
  AND token = 'mW/4lCGb9KqR5dXmgeMFzPDS1B2RhLIXoS8XWSWzlno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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