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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a3d0b7f396c5fbb21ac36b6e6d63fb0fa9788a8e863bd1ab5822794961c661' 
  AND token = 'xsXn80Q6draMzUsAFojQW5+68/p0y/ylUUOch8yzqsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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