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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366dbd0fcb6594ac4b291484490a6eb2fc8a243389116143ab02d5a2c4e6808e' 
  AND token = 'Ouxafv5TZJnV44cvnUvNg9d6/08YTgarBbMPw/Kpb/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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