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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f411f6f7e4052ae366305abed260270e3a6f54f19e530065638412dfbac0702a' 
  AND token = '1tid8JKd4m62p5OG2j1tWhBL13vWZ7hsQaWSkCVS+Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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