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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4384dd50b88a480baed9ed4f57ddf8170342df4c9cca3e9290a954ab00e0b8' 
  AND token = 's3EbqEDkfMrBZkBl7oSapKQ9NbcK5itZgc8rpDTb0wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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