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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b8bd0989eb2f9e6c3ea5a65c9fcaa28b15300d961af607731b756a51894078' 
  AND token = '9qVNpZ2shsmXE7K22M22A0ICv9ng24mIf2RIIz3PD9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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