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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0b2f1d9e68e87ef361094d33d3e7753b8bc252dc5565bce6af30396a902919' 
  AND token = 'J2pNh/JIhrNtbmGHJGSPA8oesStrCTvbnGtUPu1A7Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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