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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c920b811252e4532219fd5cc2dc23cda302ae9d916daf0f3760bc592a2852f' 
  AND token = 'iG9efX72uTpJMEzP/Vvj2OMWF0m73oBoND+7APQiPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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