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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6f04c79bc2d5e2b3313c04a992919705756cdb19d410980a29c70557af6d63' 
  AND token = 'Hs88J24uaQBxQpiRfMUdXSpORWDW2B099TWf3JPq7YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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