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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba31fa395aeac59a9c969bc682655a1e26f9331c7513c944e8851d6954cdeaad' 
  AND token = '2SPkrbKcYcgF0Wa7Wns57fFi21DpTeiSG+OB9u+eirA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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