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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616ecd4730addebd3188a89afd6819ed99782ac057bf9fad29157470cfcb5098' 
  AND token = '/1LOnnR0MsABQXOTKRsh2DVWnegkeZ2/jdviR+miDfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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