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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b7f8f17282995097f82e48c02fb1c9d90b355a5159fa4117452365ecbf7819' 
  AND token = 'l75JknAUf6Q2EG/4xGTBlo/ZcR5o/96LyGliJcmymbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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